Overheard a kerfuffle in a similar vein. Chap from upstairs on a 747 had been promoted to a seat in the pointy end, to make way for a shuffle forwards from the over-booked rear of the aircraft. But he was complaining bitterly that he'd booked a window seat, and was being inconvenienced. My heart bled.

So did the purser's. He fixed the guy with his best "concerned and helpful" look, and offered him his old seat back as an exchange with the current occupant